Valve seat stop structure of small electric control valve

Abstract

The utility model discloses a valve seat stop structure of a small electric control valve, which comprises a valve body and a valve seat, a stepping motor is arranged on the valve body, the lower end of the stepping motor is connected with a planet carrier, an output shaft is formed at the lower end of the planet carrier, the lower end of the output shaft is connected with a ball core, and a first section hole and a second section hole are arranged above the valve seat. A first-section hole and a second-section hole are formed in the valve seat, the first-section hole and the second-section hole are communicated, a step face is arranged between the first-section hole and the second-section hole, a center hole and a valve cavity are further formed in the valve seat, the center hole is communicated with the second-section hole and the valve cavity, and a movable stop boss a and a movable stop boss b are arranged on the two sides of the planet carrier respectively. The upper end face of the movable stop boss a and the upper end face of the movable stop boss b are lower than the upper end face of the planet carrier, a stop mechanism is further arranged in the valve body and comprises a static movable boss a and a static movable boss b which are arranged on the valve seat, and the check valve has the advantages of being reasonable in structure, stable in stop, capable of reducing stop impact force and lowering stop noise.

Description

Technical Field

[0001] The utility model relates to the technical field of electric control valves, in particular to a valve seat stopping structure of a small electric control valve. Background Art

[0002] Electric control valves are mainly used in cooling or heating systems and are installed on outdoor main units. When there is a leak in the indoor pipeline, the electric control valve will be closed to cut off the pipeline leading to the indoor room to prevent the refrigerant in the system from leaking into the room in large quantities, especially for flammable and explosive refrigerants, to avoid the risks of combustion, explosion, suffocation, etc. The electric control valve can also adjust the system flow. In order to cut off the flow path of the indoor pipeline, the valve body is required to have excellent sealing when closed.

[0003] The stopping stability of the stop mechanism of the electric control valve in the prior art is poor. Due to the frequent impact of the stop mechanism, the fixing strength of the fixed gear ring and the valve seat is affected to a certain extent, which will have a certain impact on the anti-fatigue performance of the product, and a large noise will be generated during the stop. At the same time, due to the vibration generated during transportation, the output shaft and the ball core will be separated during the transportation process. In view of the above problems, a solution is proposed below. Utility Model Content

[0004] The utility model aims to provide a valve seat stop structure for a small electric control valve, which has the advantages of stable stop, reduced stop impact force and reduced stop noise.

[0005] The above technical objectives of the utility model are achieved through the following technical solutions:

[0006] A valve seat stop structure of a small electric control valve comprises a valve body and a valve seat, wherein the valve body is mounted on the upper end of the valve seat, a stepper motor is arranged on the valve body, a planetary frame is connected to the lower end of the stepper motor, an output shaft is formed at the lower end of the planetary frame, a ball core is connected to the lower end of the output shaft, a first section hole and a second section hole are arranged above the valve seat, the first section hole and the second section hole are connected, a step surface is arranged between the first section hole and the second section hole, and a A center hole and a valve cavity, and the center hole is respectively connected with the second section hole and the valve cavity, and a dynamic stop boss a and a dynamic stop boss b are respectively arranged on both sides of the planetary carrier, and the upper end surfaces of the dynamic stop boss a and the dynamic stop boss b are lower than the upper end surface of the planetary carrier, and a stop mechanism is also arranged in the valve body, and the stop mechanism includes a stationary dynamic boss a and a stationary dynamic boss b arranged on the valve seat, and the stationary dynamic boss a and the stationary dynamic boss b are respectively matched with the dynamic stop boss a and the dynamic stop boss b.

[0007] Preferably, a first sealing block and a second sealing block are provided at both ends of the ball core, and the first sealing block and the second sealing block are both located in the valve seat, the first sealing block and the second sealing block are both provided with valve ports, and the ball core is provided with a through hole.

[0008] Preferably, a first sealing ring and a second sealing ring are further provided in the valve seat, and the first sealing ring and the second sealing ring are respectively located on a side of the first sealing block and the second sealing block away from the ball core.

[0009] Preferably, a liquid inlet pipe and a liquid outlet pipe are respectively inserted at both ends of the valve seat, and clamping rings are respectively arranged between the liquid inlet pipe, the liquid outlet pipe and the valve seat.

[0010] Preferably, the stationary moving boss a, the stationary moving boss b and the moving stop boss a, the moving stop boss b are located at the same axial height as the planet carrier.

[0011] The beneficial effects of the utility model are as follows: by setting a stop mechanism, and the stationary dynamic boss a, the stationary dynamic boss b and the valve seat are integrated, the impact force of the stop is directly borne by the valve seat, the fatigue life is more reliable, and at the same time the stop mechanism is directly arranged in the radial extension direction of the planetary carrier, so that no other additional force is generated during the stop, the stop is more stable, and at the same time the stop position is arranged at the edge of the lower part of the fixed gear ring, which increases the stop radius. Under the condition of the same stopping torque, the longer the stopping force arm, the smaller the stopping impact force, the lighter the impact sound, which is beneficial to reducing the stopping noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of an embodiment;

[0013] Figure 2 A partial structural top view of an embodiment;

[0014] Figure 3 It is a partial structural schematic diagram of an embodiment;

[0015] Figure 4 Schematic diagram of the structure of the valve seat in the embodiment.

[0016] Figure numerals: 1. valve body; 2. valve seat; 3. stepper motor; 4. planetary carrier; 5. output shaft; 6. ball core; 7. first section hole; 8. second section hole; 9. step surface; 11. center hole; 12. valve chamber; 13. dynamic stop boss a; 14. dynamic stop boss b; 15. stop mechanism; 16. stationary dynamic boss a; 17. stationary dynamic boss b; 18. first sealing block; 19. second sealing block; 20. first sealing ring; 21. second sealing ring; 22. liquid inlet pipe; 23. liquid outlet pipe; 24. retaining ring. DETAILED DESCRIPTION

[0017] The following is only a preferred embodiment of the present invention, and the protection scope is not limited to this embodiment. All technical solutions under the concept of the present invention should belong to the protection scope of the present invention. The same parts are represented by the same figure marks. It should be noted that the words "front", "rear", "left", "right", "up" and "down" used in the following description refer to the directions in the drawings, and the words "bottom" and "top", "inside" and "outside" refer to the directions toward or away from the geometric center of a specific component, respectively.

[0018] like Figures 1 to 4 As shown, a valve seat stop structure of a small electric control valve comprises a valve body 1 and a valve seat 2, wherein the valve body 1 is mounted on the upper end of the valve seat 2, a stepper motor 3 is arranged on the valve body 1, a planet carrier 4 is connected to the lower end of the stepper motor 3, an output shaft 5 is formed at the lower end of the planet carrier 4, a ball core 6 is connected to the lower end of the output shaft 5, a first section hole 7 and a second section hole 8 are arranged above the valve seat 2, and the first section hole 7 and the second section hole 8 are interlinked, a step surface 9 is arranged between the first section hole 7 and the second section hole 8, and when the fixed gear ring in the electric control valve is assembled, it can abut on the step surface 9, and a center hole 11 and a valve cavity 12 are also arranged on the valve seat 2, and the center hole 11 is interlinked with the second section hole 8 and the valve cavity 12 respectively. The output shaft 5 extends from the center hole 11 into the valve cavity 12, and is plug-in connected with the ball core 6 in the valve cavity 12, and the output shaft 5 is guided by the center hole 11 to ensure its rotation accuracy. In the present application, the output shaft 5 is integrated with the planet carrier 4, and the planet carrier 4 rests on the end face of the center hole 11. There is no risk of the output shaft 5 being detached. The planet carrier 4 is rotated to a suitable position, and the ball core 6 is inserted, so that the planet carrier 4 and the ball core 6 form an embedded assembly structure.

[0019] The planet carrier 4 is provided with a moving stop boss a13 and a moving stop boss b14 on both sides, and the upper end surfaces of the moving stop boss a13 and the moving stop boss b14 are lower than the upper end surface of the planet carrier 4. The valve body 1 is also provided with a stop mechanism 15, which includes a stationary moving boss a16 and a stationary moving boss b17 provided on the valve seat 2, and the stationary moving boss a16 and the stationary moving boss b17 are matched with the moving stop boss a13 and the moving stop boss b14 respectively. When the planet carrier 4 is installed in the valve seat 2, the moving stop boss a13 and the moving stop boss b14 are The upper end surface 14 is also lower than the step surface 9 in the valve seat 2. Therefore, the upper end surfaces of the moving stop boss a13 and the moving stop boss b14 are also below the lower end surface of the fixed ring gear, which is equivalent to the planetary carrier 4 being movably clamped by the lower end surface of the fixed ring gear and the end surface of the center hole 11 in the valve seat 2. During transportation and vibration, the output shaft 5 is ensured not to be detached from the ball core 6. In order to ensure that the output shaft 5 can rotate reliably and not be detached from the ball core 6, the clearance between the upper end surfaces of the moving stop boss a13 and the moving stop boss b14 and the lower end surface of the fixed ring gear is controlled to be between 0.1-0.6.

[0020] In order to limit the rotation angle of the ball core 6 and ensure that the ball core 6 is fully open and fully closed, the rotation angle of the ball core 6 is 90 degrees. Therefore, the rotation angle of the ball core 6 can be limited by the stopping mechanism 15. The frequent impact of the stopping mechanism 15 has a certain influence on the fixing strength of the fixed gear ring and the valve seat 2. Therefore, the present application casts the stationary dynamic boss a16 and the stationary dynamic boss b17 with the valve seat 2 as one piece, and the fatigue impact can be borne by the stationary dynamic boss of the valve seat 2, which greatly improves the anti-fatigue performance of the product.

[0021] The stationary moving boss a16, the stationary moving boss b17 and the moving stop boss a13, the moving stop boss b14 are located at the same axial height as the planet carrier 4, making full use of the space, so that the product can be further reduced in the axial direction, and the miniaturization of the electric ball valve is achieved. At the same time, the stop mechanism 15 is directly arranged in the radial extension direction of the planet carrier 4, so that no other additional force is generated during the stop, and the stop is more stable. At the same time, the stop position is set at the edge of the lower part of the fixed gear ring, which increases the stop radius. Under the same stop torque, the longer the stop force arm, the smaller the impact force of the stop, and the lighter the impact sound, which is conducive to reducing the stop noise.

[0022] A first sealing block 18 and a second sealing block 19 are provided at both ends of the ball core 6, and the first sealing block 18 and the second sealing block 19 are both located in the valve seat 2, and valve ports are provided on the first sealing block 18 and the second sealing block 19, and a through hole is provided on the ball core 6. The planetary carrier 4 can be driven to rotate by rotating the stator of the stepper motor 3, thereby driving the output shaft 5 to rotate, and then transmitting to the ball core 6 through the output shaft 5, and the ball core 6 rotates with the output shaft 521. During the rotation of the ball core 6, the valve ports on the first sealing block 18 and the second sealing block 19 are connected with the through hole of the ball core 6, and the electric control valve is in an open state at this time. When the valve port is completely opposite to the through hole, the electric control valve is in a fully open state. When it is rotated 90° in the fully open state, the electric control valve is in a fully closed state, and the spherical surface of the ball core 6 contacts the arc surface of the first sealing block 18 and the second sealing block 19. During the above-mentioned 0-90° rotation process, flow regulation can be achieved.

[0023] A first sealing ring 20 and a second sealing ring 21 are also provided in the valve seat 2, and the first sealing ring 20 and the second sealing ring 21 are respectively located on the side of the first sealing block 18 and the second sealing block 19 away from the ball core 6, and a liquid inlet pipe 22 and a liquid outlet pipe 23 are respectively inserted at both ends of the valve seat 2, and a clamping ring 24 is respectively provided between the liquid inlet pipe 22, the liquid outlet pipe 23 and the valve seat 2. The first sealing ring 20 and the second sealing ring 21 can increase the sealing performance of the valve seat 2 to ensure the sealing performance of the electric control valve.

[0024] The specific embodiments described above further illustrate the technical problems, technical solutions and beneficial effects solved by the present invention. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A valve seat stop structure for a small electric control valve, characterized in that: The invention comprises a valve body (1) and a valve seat (2), wherein the valve body (1) is mounted on the upper end of the valve seat (2), a stepper motor (3) is arranged on the valve body (1), the lower end of the stepper motor (3) is connected to a planetary frame (4), an output shaft (5) is formed at the lower end of the planetary frame (4), and a ball core (6) is connected to the lower end of the output shaft (5), a first section hole (7) and a second section hole (8) are arranged above the valve seat (2), and the first section hole (7) and the second section hole (8) are connected to each other, a step surface (9) is arranged between the first section hole (7) and the second section hole (8), and a center hole (11) and a valve cavity (12) are also arranged on the valve seat (2), and the The center hole (11) is connected to the second hole (8) and the valve cavity (12) respectively. A moving stop boss a (13) and a moving stop boss b (14) are respectively provided on both sides of the planet carrier (4), and the upper end surfaces of the moving stop boss a (13) and the moving stop boss b (14) are lower than the upper end surface of the planet carrier (4). A stop mechanism (15) is also provided in the valve body (1). The stop mechanism (15) includes a stationary moving boss a (16) and a stationary moving boss b (17) provided on the valve seat (2), and the stationary moving boss a (16) and the stationary moving boss b (17) are respectively matched with the moving stop boss a (13) and the moving stop boss b (14).

2. The valve seat stop structure of a small electric control valve according to claim 1, characterized in that: A first sealing block (18) and a second sealing block (19) are provided at both ends of the ball core (6), and the first sealing block (18) and the second sealing block (19) are both located in the valve seat (2), the first sealing block (18) and the second sealing block (19) are both provided with valve ports, and the ball core (6) is provided with a through hole.

3. The valve seat stop structure of a small electric control valve according to claim 2, characterized in that: A first sealing ring (20) and a second sealing ring (21) are also provided in the valve seat (2), and the first sealing ring (20) and the second sealing ring (21) are respectively located on a side of the first sealing block (18) and the second sealing block (19) away from the ball core (6).

4. The valve seat stop structure of a small electric control valve according to claim 3, characterized in that: A liquid inlet pipe (22) and a liquid outlet pipe (23) are respectively inserted at both ends of the valve seat (2), and a clamping ring (24) is respectively provided between the liquid inlet pipe (22), the liquid outlet pipe (23) and the valve seat (2).

5. The valve seat stop structure of a small electric control valve according to claim 4, characterized in that: The stationary moving boss a (16), the stationary moving boss b (17) and the moving stop boss a (13), the moving stop boss b (14) are located at the same axial height as the planet carrier (4).

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